The White House in the spring blocked release of government estimates on the worst-case scenario of the amount of oil that was spewing from BP's well in the Gulf of Mexico, the presidential commission looking into the accident said on Wednesday.

The commission said its staff was told that in late April or early May that the National Oceanic and Atmospheric Administration wanted to make public some of its long-term, worst-case spill models for the Deepwater Horizon accident and requested approval from the White House's Office of Management and Budget to make the information public.